SY31-0458-3_Section_07_62EH_Disk.pdf part of IBM SY31-0458-3 Section 07 62EH Disk SY31-0458-3_Section_07_62EH_Disk.pdf, IBM system34 fe SY31-0458-3_System_34_5340_System_Unit_Theory_Diagrams_Manual_Jul79 SY31-0458-3_Section_07_62EH

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Contents
62EH DISK DRIVE AND ATTACHMENT 7-1 Track Follow Principles . 7-30
INTRODUCTION 7-1 Track Follow 7-30
62EH Disk Drive . 7-:1 Track Follow Waveshapes 7-31
Subframe 7-2 Servo Clock 7-32
Grounding . . 7-2 Servo Clock Waveshapes 7-33
Disk Enclosure 7-2 Phase Lock Oscillator 7-34
Disk Spindle . 7-3 Phase Lock Oscillator Synchronization 7-34
Transducer . . 7-3 Recalibrate Operation 7-35
Actuator Lock 7-3 Disk Ready 7-37
Actuator . . . 7-4 Seek Operation 7-38
Actuator Position Indicator 7-4 Seek 7-38
Circuit Locations 7-4 Actuator Feedback During Seek. 7-39
Motor and Brake . . . 7-4 Seek Waveshapes 7-41
Write Safety . . . . . . 7-5 Power On and Off. 7-42
Data Unsafe Conditions 7-5 Power On and Seek Home 7-43
File Ready . 7-5 Cycle Steal 7-44
Disk Speed. 7-5 Cycle Steal from the Control Processor 7-44
Power On . 7-5 Cycle Steal to the Control Processor 7-45
Disk Format. . 7-5 Control Storage Initial Program Load 7-46
Data Tracks 7-5 Command Bus In 7-47
Sector Format 7-6 COMMANDS 7-48
Disk Addressing .. 7-7 I/O Load Command-I/O Control Load
Servo Tracks . 7-8 Command 7-48
Landing Zone . 7-8 I/O Sense Command-I/O Control Sense
Guard Band 7-8 Command 7-50
Data Recording 7-8 Sense Interrupt Level Status Byte Command 7-52
Actuator Movement 7-9 Jump on I/O Command 7-54
Seek . . . . . 7-9 ERROR CONDITIONS 7-56
Recalibrate . . . 7-9 Write Data Echo Check 7-56
Servo Track Follow 7-10 DBO Parity Check 7-57
Head Alignment and Disk Description 7-11 Cycle Steal Overrun Check 7-58
Missing Clock Pulse and Position Pulses 7-11 Overrun Circuit Description 7-58
Guard Band 7-11 SERDES Check 7-60
Behind Home. 7-11 Cyclic Redundancy Check. 7-61
DATA FLOW . . , 7-12 Sector Check 7-62
OPERATIONS . . 7-13 Sector Check Circuit Description 7-62
Write Identification 7-14 . Not Valid Seek Address 7-63
Read Identification . 7-15 Write Check 7-64
Write Data . . 7-16 Channel Transfer Check 7-65
Read Data 7-18 Sector Sync Check 7-66
Read Diagnostic 7-18 Off Track Check . 7-67
Read Verify .. . 7.;.18 PLO Out of Sync 7-68
Scan Read Data Equal 7-20 Interrupt Time-out Check . 7-69
Scan Read Data Low or Equal